___________(20)
A.wouldn't
B.haven't
C.did
D.didn't

___________(18)
A.have
B.had
C.have to
D.must

It’s waste of time to try to explain anything to Tony.
A.Tony should be given explanation
B.It’s not worthy trying to explain anything to Tony
C.To save time, explain it to Tony
D.It’s well worth trying to explain things to Tony

At the factory, he likes people to let him save his own way
A.At the factory, he doesn’t like it when people to let him what to do
B.At the factory, he often needs the help of other people in his work
C.At the factory, he doesn’t accept help from people he dislikes
D.At the factory, he likes people to think all good ideas are his own

The team reached the top of the mountain. The team spent a night there.
A.The team had not only reached the top of the mountain, but they spend a night there as well.
B.Not only did the team reach the top of the mountain but they also spent a night there
C.Not only did the team reach the top of the mountain but they also spent a night there as well
D.The team both reach the top of the mountain but they also spent a night there

The criminals got away in spite of the efforts of the police
A.Without the efforts of the police, the criminals would have escaped
B.Even though the police made their efforts, the criminals escaped
C.Thanks to the efforts of the police, the criminals were imprisoned
D.The criminals were caught because of the efforts of the police

The manager contributed generously, so I could continue my plan.
A.Had it not been for the manager’s generous contribution, I couldn’t continue my plan.
B.The manager’s generous contribution got my plan continue.
C.But for the manager’s generous contribution, l couldn’t have continued my plan.
D.Should the manager contribute generously, l could continue my plan.

My grandparents' lake house was built in 1953. It was completely destroyed by the forest fire.
A.My grandparents' lake house built in 1953 and was completely destroyed by the forest fire.
B.My grandparents' lake house, built in 1953, was completely destroyed by the forest fire
C.My grandparents' lake house was built in 1953, so it was completely destroyed by the forest fire
D.The forest fire destroyed my grandparents' lake house was built in 1953

The rate of inflation has fallen steadily during recent months.
A.There has been a steady decline of the rate of inflation during recent months.
B.There is a steady decline of the rate of inflation during recent months.
C.There is a steady decline of the rate in inflation during recent months.
D.There has been a steady decline in the rate of inflation during recent months.

We had better leave him a note because it is possible they will arrive late.
A.We had better leave him a note in case they may arrive late.
B.We had better leave him a note in case they will arrive late.
C.We had better leave him a note in case they are likely to arrive late.
D.We had better leave him a note in case they arrive late.